Beating-up device for looms

ABSTRACT

In the device, the reed is made in the form of toothed discs which are so fitted on a drive shaft that they are angularly displaced relative to one another and their teeth form a helical surface and serve to beat up the weft thread to the fell of the fabric in the process of its formation. The discs are secured to the shaft by means of a key with splines, and each disc is provided with projections evenly distributed over the entire perimeter of its centre hole, which projections enter said splines of the key to form a key-and-spline connection between the shaft and the discs. Such a design simplifies the manufacture of the discs and facilitates their fitting on the shaft. The present invention can be most advantageously utilized in travelling wave looms.

Titov et a1.

Sept. 2, 1975 BEATING-UP DEVICE FOR LOOMS Inventors: Dmitry Vladimirovich Titov, 13

Parkovaya ulitsa, 27, korpus 2, kv. 49; Tatyana Konstantinovna Filatova, B. Dorogomilovskaya ulitsa, 31, kv. 290, both of Moscow, USSR.

Filed: Jan. 30, 1974 Appl. NO.Z 437,952

U.S. Cl 139/12; 139/191 Int. Cl. D03D 47/26 Field of Search 139/12, 79, 80, 188, 190,

9/1967 Rossmann 139/12 7/1973 Titov 139/12 Primary Examiner-Henry S. Jaudon Attorney, Agent, or FirmWaters, Schwartz & Nissen ABSTRACT In the device, the reed is made in the form of toothed discs which are so fitted on a drive shaft that they are angularly displaced relative to one another and their teeth form a helical surface and serve to beat up the weft thread to the fell of the fabric in the process of its formation. The discs are secured to the shaft by means of a key with splines, and each disc is provided with projections evenly distributed over the entire perimeter of its centre hole, which. projections enter said splines of the key to form a key-and-spline connection between the shaft and the discs.

Such a design simplifies the manufacture of the discs and facilitates their fitting on the shaft.

The present invention can be most advantageously utilized in travelling wave looms.

3 Claims, 3 Drawing Figures BEATING-UP DEVICE FOR LOOMS The present invention relates to weaving looms, and more particularly to beating-up devices used in these looms.

This invention can be most advantageously employed in looms with travelling wave, i.e., looms in which the warp threads form a number of sheds, each accommodating a weft carrier. However, the present invention can be employed in ordinary looms, as well as in looms wherein the weft thread ispicked through the shed by rapiers, micro-shuttles, or air.

Known in the art are beating-up devices in which a reed is in the form of discs with teeth. The reed is fitted on a drive shaft by means of a key, and the discs are angularly displaced relative each other their teeth forming a helical surface and serving for beating up the weft thread to the fell of the fabric in the process of its formation (cf. USSR Inventors Certificate No 250041,CL. 86c, 17)". In this device, the discs are secured to the shaft by means of a straight key, and the relative displacement of the discs on the shaft is realized by providing each disc with a key.. slot, the key slot of each subsequent disc being displaced relative to the key slot of the preceding disc through an angle required to form a helical surface. The pitch of the helical surface is chosen according to the number of the weft thread carriers laid across the width of the fabric, and the number of discs within the pitch is chosen according to the kindof fabric, i.e., its warp density.

Thus, for a complete set of the reed discs it is necessary to have a large number of their modifications differing by the location of their key slots, which complicates the process of making the discs and fitting them on the shaft.

It is an object of the present invention to provide a loom beating-up device that would simplify the manufacture of the reed discs.

Another object of the invention is to provide a beat ing-up device that would facilitate accurate fitting of thediscs on the shaft.

An important object of the invention is to provide a device that would improve the operating conditions of the reed discs which is achieved by way-of improving the unit for fitting the discs on the shaft.

With these and other objects in view, in a beating-up device for looms wherein a reed having the form of toothed discs is fitted on a drive shaft and secured thereto by means of a key the discs being angularly displaced relative to one another so that their teeth form a helical surface and serve for beating up the weft thread to the fell of the fabric in the process of its formation, an improvement, according to the invention, comprising a plurality of splines provided in the key throughout its length, each having over the entire periphery of its centre bore are evenly distributed projections entering said splines of the key to form a key-andspline connection between the shaft and the discs, and the number of these projections in each disc is chosen as a multiple to the number of discs within one pitch of the helical surface, which is required for weaving a fabric with a specified warp density, each disc being secured to the key of the drive shaft through the respective projection so as to provide for a relative displacement of the projections of adjacent discs through an angle a, and, consequently, for the formation of the helical surface by the disc teeth. Such a design substantially simplifies the manufacture of the reed discs and facilitates their fitting on the drive shaft, since all the discs are made identical and their positioning on the shaft is accomplished by turning each subsequent disc relative to the preceding one by one projection, i.e., through the angle a.

In case the fabric is to have low warp density, i.e., in the case of a small number of discs within one pitch, the number of projections in each disk should be equal to the number of discs per one pitch of the helical surface of the disc teeth, and the center angle ,8 between the projections in each disc should be equal to a, which further simplifies the manufacture of the discs and their fitting on the shaft.

In the case of manufacturing fabric with high warp density, i.e., in the case of a large number of discs per pitch, the size of the projections on the discs should be increased to render them easier in manufacture. For this purpose, the discs should be arranged on the shaft in groups and the number of projections on each disc in each group should be a multiple of the quotient of the number of discs per pitch of the helical surface of the disc teeth and the number of discs in one group, the angle ,8 should be equal to the angle a multiplied by the number of discs in one group, and one of the projections of the first disc of the group being aligned with one of the teeth of this disc, while the projections of each of the subsequent discs in the same group are displaced relative to said aligned projection through an angle equal to the angle a multiplied by a number equal to the serial number of the given disc in the group minus one. I

The invention will be best understood from a particular exemplary embodiment'thereof with reference to the accompanying drawings, wherein:

FIG. 1. is a general side view diagram of theproposed beating-up device; 7 I

FIG. 2 shows a cross-sectional view of the key-andspline connection between the discs andthe shaft;

FIG. 3 is a top view of the device of FIG. 1.

The beating-up device comprises a reed made in the form of discs 1 (FIG. 1) with teeth 2, 3 and 4 which are fitted on a drive shaft 5, the teeth 2 being short and serving to propel a carrier 6 for a weft thread 7 in the shed formed by warp threads 8 (FIG. 3) and as to move the weft thread 7 toward the fell of the fabric 9, and the teeth 3 and 4 being longer and serving to beat up the weft thread to the fell of the fabric 9 in the process of its formation.

The discs 1 (FIG. 1) are fitted on the shaft 5 and secured thereto by means of a key 10 which is provided with splines 11, and each of the discs is provided, over the entire periphery of its centre bore 12, with evenly distributed projections or dents l3 entering the splines 1 1 of the key 10 to form a key-and-spline joint between the drive shaft and the reed discs. The discs on the shaft are displaced relative to one another through an angle a, so that their teeth form a helical surface with a preset pitch t( FIG. 3), the number of discs within this pitch being chosen according to the specified warp density of the fabric.

This displacement is accomplished by choosing the number of dents 13 (FIG. 1) in each disc 1 as a multiple to the number of discs within one pitch 2 of the helical surface, while each disc is secured to the splines 11 of the key 10 through the respective dent, so that adjacent discs, and hence, their dents, will be relatively displaced through'the angle a.

In the case of manufacturing fabric with a low warp density, i.e., in the case of a small number of discs within the pitch of the helical surface, the number of dents 13 in each disc 1 is equal to the number of discs per pitch of the helical surface, and the center angle B between adjacent dents in each disc is equal to the angle a. In this case discs 1 are displaced relative to one another by one dent 13.

In the case when it is necessary to increase the size of the dents, their number in each disc is reduced and the center angle B therebetween is increased. In this case discs 1 are arranged on the drive shaft 5 in groups, the number of dents 13 on each disc 1 in each of the groups should be a multiple of the quotient of the number of discs per pitch t of the helical surface and the number of discs in one group, and the angle B (FIG. 2) should be equal to the angle a multiplied by the number of discs in one group. Also, one of the dents 13 of the first disc 1 of the group being aligned with any of teeth 2, 3 and 4 of this disc, while the dents 13 of each of the subsequent discs in this group are displaced relative to said aligned dent through an angle equal to the angle a multiplied by a number which is equal to the serial number of the given disc in the group minus one.

EXAMPLES To obtain fabric with a specified warp density, 144 discs 1 with teeth 2, 3 and 4 must be arranged within the pitch t of the helical surface. If the discs are made according to the first of the above-described embodiments, the number of dents 13 on each of the discs equals 144 and their central angle B equals 2.5", the angle a being equal to angle B, i.e., 2.5. Hence, each disc is displaced relative to the next one by one dent, i.e., through 2.5, and all the 144 discs make 360 within one pitch 1 of the helical surface.

Whenever the size of the dents must be doubled, discs 1 are arranged on the shaft 5 in groups each consisting of two discs I and II. The number of dents 13 in each disc equals 72 and their angle B equals 2 a, i.e., 5. One of the dents on the first disc 1 of the group is aligned with any of teeth 2, 3 and 4, while the dents 13 of the second disc II of the group are displaced relative to this aligned dent through 2.5, i.e., through the angle Discs 1 and II alternate on the shaft and hence are displaced relative to one another through the angle a, while the group of discs I and II is displaced relative to its adjacent group through the angle B, i.e., by one dent 13. After discs I and ll are assembled on the shaft 5, their teeth 2, 3 and 4 form a helical surface with the preset pitch t, since B 72 .72 360.

If the size of the dents must be increased three times, the discs 1 are arranged on the shaft 5 in groups each comprising three discs I, II and Ill. The number of dents in each disc equals 48, and their angle B equals 3a, i.e.,

. The dents of the subsequent discs in the group are displaced relative to the aligned dent of the first disc I of the group as follows: the dents 13 of the second disc ll are displaced through the angle a 1, i.e. through 2.5", and the dents 13 of the third disc III are displaced through 01.2, i.e., 5. The next first disc of a subsequent group will be displaced relative to the first disc of the preceding group through the angle B, i.e., through 3 a, as is shown in FIGS. 1 and 2. To simplify the assembly of the discs on the shaft, it is advisable to mark the discs I, ll and III with different colours.

Thus, the proposed key-and-spline joint between th shaft and the discs simplified their fitting on the shaft, i.e., improves their handling conditions without affecting the weaving process.

What is claimed is:

l. A beating-up device for looms, comprising: a drive shaft; a key of said drive shaft; splines made in said key throughout its length; discs with teeth for the propulsion of weft thread carriers, each of said discs having a bore for being fitted on said drive shaft; evenly distributed projections provided over the periphery of said bore and intended to engage said splines of said key, to produce a key-and-spline joint between said drive shaft and said discs; each of said discs being coupled to said key by means of a respective projection so as to provide for relative displacement of the projections of adjacent discs through an angle a required for the teeth of the totality of discs to form a helical surface serving to beat up the weft thread to the fell of the fabric in the process of its formation; and in each of said discs, the number of said projections being chosen as a multiple to the number of discs within one pitch of the helical surface, which is required for weaving a fabric with a specified warp density.

2. A device as claimed in claim 1, wherein the number of said projections in each of said discs equals the number of discs within one pitch of the helical surface, and the center angle B between said projections in each disc equals the angle a.

3. A device as claimed in claim 1, wherein said discs are arranged on said drive shaft in groups, the number of said projections on each said disc in each group being a multiple of the quotient of the number of discs per pitch of the helical surface and the number of discs in one group, the center angle B between said projections in each disc being equal to the angle a multiplied by the number of discs in one group, one of said projections of the first disc of the group being aligned with one of said teeth of this disc, while said projections of each of the subsequent discs in the same group are displaced relative to said aligned projection through an angle equal to the angle 01 multiplied by a number equal to the serial number of the given disc in its group minus 

1. A beating-up device for looms, comprising: a drive shaft; a key of said drive shaft; splines made in said key throughout its length; discs with teeth for the propulsion of weft thread carriers, each of said discs having a bore for being fitted on said drive shaft; evenly distributed projections provided over the periphery of said bore and intended to engage said splines of said key, to produce a key-and-spline joint between said drive shaft and said discs; each of said discs being coupled to said key by means of a respective projection so as to provide for relative displacement of the projections of adjacent discs through an angle Alpha required for the teeth of the totality of discs to form a helical surface serving to beat up the weft thread to the fell of the fabric in the process of its formation; and in each of said discs, the number of said projections being chosen as a multiple to the number of discs within one pitch of the helical surface, which is required for weaving a fabric with a specified warp density.
 2. A device as claimed in claim 1, wherein the number of said projections in each of said discs equals the number of discs within one pitch of the helical surface, and the center angle Beta between said projections in each disc equals the angle Alpha .
 3. A device as claimed in claim 1, wherein said discs are arranged on said drive shaft in groups, the number of said projections on each said disc in each group being a multiple of the quotient of the number of discs per pitch of the helical surface and the number of discs in one group, the center angle Beta between said projections in each disc being equal to the angle Alpha multiplied by the number of discs in one group, one of said projections of the first disc of the group being aligned with one of said teeth of this disc, while said projections of each of the subsequent discs in the same group are displaced relative to said aligned projection through an angle equal to the angle Alpha multiplied by a number equal to the serial number of the given disc in its group minus one. 